Bloc Québécois Leader Gilles Duceppe is open to supporting a coalition with either the NDP or Liberals, but there’s one party he refuses to consider aligning with, should October’s election result in a minority government.

“I’m always open, but no blank cheque and certainly not with Stephen Harper,” Duceppe said in an interview airing Sunday on CBC News Network’s Power & Politics.

“The Harper we knew in 2004 when [then NDP Leader] Jack Layton and I went together with him is not the same Harper that we know now,” Duceppe told host Rosemary Barton.

“When he had a majority [in 2011], we then saw the real Stephen Harper and I don’t see any possibility of supporting any kind of coalition with him.”

Duceppe said the Conservatives won in the last election because “the Liberals and NDP divided the vote” in Canada, but not in Quebec.

“Harper only has five members elected in Quebec,” he pointed out. “The question in Quebec is, people want to beat Harper, and what we’re telling people is that we always won over Harper.”

But the Conservative Party leader may not be Duceppe’s main challenger to fear in the upcoming election.

Despite saying that “for years, the NDP was not a real opponent,” Duceppe admitted that the political scene has changed, and that now NDP Leader Tom Mulcair is the man to beat.

“In a certain sense, we are in the place the NDP was in the beginning of the last campaign, and they are where we were. It changed during the [2011] campaign and we have the firm intention to change that also,” he said.

Now, his comeback as Bloc leader is focused firmly on preventing a similar orange wave from cresting once more.

“I still have six weeks to tell [Quebecers] that the real Thomas or Tom is, when you look at it, a Liberal supporting a Liberal and we’re against those policies in Quebec,” he said of Mulcair.

Duceppe warned that if elected, the NDP would not defend Quebec’s interests in Ottawa.

“They’re saying something in Canada and another thing in Quebec,” he said. “We have Tom in Canada, and Thomas in Quebec. So two persons in the same body.”

When asked for examples, Duceppe pointed to the NDP’s pipeline policy on Energy East. Mulcair has said he would allow the pipeline if it passed rigorous environmental study.​

“Almost everybody is against the pipeline and they just don’t understand why the NDP is supporting it,” Duceppe said of the project, which is controversial in Quebec. “We all know they don’t want to lose votes in the West, in New Brunswick. We can come with a lot of examples of the NDP supporting things Quebecers are against.” […]

There is one issue where there is consensus between the Bloc and the NDP, Duceppe said.

“On certain policies, like Thomas Mulcair supporting the right for Quebecers to decide their own future in a referendum at 50 per cent plus one, Trudeau is against,” he said.

“The NDP is proposing the same thing as Stephen Harper — austerity. It’s the worst strategy when you’re facing an economic crisis,” he said.

“We’re not proposing a huge deficit, but proposing austerity is the worst proposal,” he said, adding that his position against austerity isn’t an endorsement of the Liberals’ deficit spending either.

“Before commending the NDP, Liberal or Stephen Harper’s plans, I want to see the whole plan,” he said. “Where are they taking money? From the Employment Insurance Fund? I want to see all of that before committing to a plan.” […]

With Labour Day marking the unofficial second phase of the 11-week campaign, Duceppe said his party is ready to ramp up campaigning activities in the final six weeks before the election.